/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.menuItem;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.MenuItem;
import com.blandware.atleap.model.core.Role;
import com.blandware.atleap.service.core.MenuManager;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SelectRolesForm;
import com.blandware.atleap.webapp.util.core.CacheUtil;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.springframework.orm.ObjectOptimisticLockingFailureException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;

/**
 * <p>Assigns Roles to menu item
 * </p>
 * <p><a href="AssignMenuItemRolesAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.16 $ $Date: 2006/08/03 10:07:59 $
 * @struts.action path="/core/menuItem/assignRoles"
 * name="selectRolesForm"
 * scope="request"
 * input="inputForward"
 * validate="true"
 * roles="core-menuItem-assignRoles"
 * @struts.action-forward name="inputForward"
 * path=".core.menuItem.assignRoles"
 * @struts.action-forward name="listMenuItems"
 * path="/core/menuItem/list.do"
 * redirect="true"
 * @struts.action-forward name="callAssignRoles"
 * path="/core/menuItem/callAssignRoles.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/core/menuItem/list.do"
 */
public final class AssignMenuItemRolesAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		Long ownerId = null;
		if ( request.getSession().getAttribute(WebappConstants.OWNER_ID_KEY) != null ) {
			ownerId = (Long) request.getSession().getAttribute(WebappConstants.OWNER_ID_KEY);
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing owner ID. Returning to index...");
			}
			return mapping.findForward("admin");
		}

		if ( !isCancelled(request) ) {
			// acquire POJOs for all selected roles
			RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);
			SelectRolesForm selectRolesForm = (SelectRolesForm) form;
			String[] selectedRoleNames = selectRolesForm.getSelectedRoles();

			List roles = new ArrayList();
			for ( int i = 0; i < selectedRoleNames.length; i++ ) {
				String roleName = selectedRoleNames[i];
				Role role = roleManager.retrieveRole(roleName);
				if ( role != null ) {
					roles.add(role);
				}
			}

			Long menuItemId = (Long) request.getSession().getAttribute(WebappConstants.MENU_ITEM_ID_KEY);
			MenuManager menuManager = (MenuManager) getBean(Constants.MENU_MANAGER_BEAN);
			MenuItem menuItem = menuManager.retrieveMenuItem(menuItemId);

			if ( menuItem == null ) {
				// menu item not found. it might be deleted by someone else
				ActionMessages errors = new ActionMessages();
				errors.add("menuItemNotFound", new ActionMessage("core.menuItem.errors.notFound"));
				saveErrors(request, errors);
				return mapping.findForward("listMenuItems");
			}

			menuItem.setVersion(Long.valueOf(selectRolesForm.getVersion()));

			// remove roles which were unselected
			// list of roles is copied in order to prevent ConcurrentModifictionException to be thrown
			List menuItemRoles = new ArrayList(menuItem.getRoles());
			for ( int i = 0; i < menuItemRoles.size(); i++ ) {
				Role role = (Role) menuItemRoles.get(i);
				if ( !roles.contains(role) ) {
					menuItem.removeRole(role);
				}
			}

			// add new roles
			for ( Iterator i = roles.iterator(); i.hasNext(); ) {
				Role role = (Role) i.next();
				menuItem.addRole(role);
			}

			Long parentItemId = null;
			if ( menuItem.getParentItem() != null ) {
				parentItemId = menuItem.getParentItem().getId();
			}

			try {
				menuManager.updateMenuItem(menuItem, parentItemId, ownerId);
			} catch ( ObjectOptimisticLockingFailureException e ) {
				// menu item was updated or deleted by another transaction
				ActionMessages errors = new ActionMessages();
				errors.add("updateFailed", new ActionMessage("core.menuItem.errors.updateFailed"));
				saveErrors(request, errors);
				request.setAttribute(WebappConstants.MENU_ITEM_ID_KEY, menuItem.getId());
				return mapping.findForward("callAssignRoles");
			}

			// flush cache
			CacheUtil cacheUtil = CacheUtil.getInstance(request);
			cacheUtil.flushMenuCache();
			cacheUtil.flushContentPageCache();

		}
		return mapping.findForward("listMenuItems");
	}
}